DE102015105718A1 - Semiconductor diode - Google Patents
Semiconductor diode Download PDFInfo
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- DE102015105718A1 DE102015105718A1 DE102015105718.2A DE102015105718A DE102015105718A1 DE 102015105718 A1 DE102015105718 A1 DE 102015105718A1 DE 102015105718 A DE102015105718 A DE 102015105718A DE 102015105718 A1 DE102015105718 A1 DE 102015105718A1
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Abstract
In einer Halbleiterdiode umfasst ein Halbleiterkörper (100) einen Injektionseffizienzsteuerbereich (140) zwischen einem Driftbereich (120) eines ersten Leitfähigkeitstyps und einem ersten Elektrodenbereich (110) eines zweiten, entgegengesetzten Leitfähigkeitstyps. Der Injektionseffizienzsteuerbereich (140) umfasst eine Superjunctionstruktur, die einen Barrierebereich (142) des ersten Leitfähigkeitstyps und einen Kompensationsbereich (144) eines zweiten Leitfähigkeitstyps aufweist, welche nacheinander längs einer lateralen Richtung und direkt aneinandergrenzend angeordnet sind. Eine Nettodotierstoffkonzentration des Barrierebereiches (142), gemittelt längs einer vertikalen Ausdehnung des Barrierebereiches (142), ist wenigstens dreimal größer als eine Nettodotierstoffkonzentration des Driftbereiches (120), gemittelt längs 20% einer vertikalen Ausdehnung der Driftzone angrenzend an den Barrierebereich (142).In a semiconductor diode, a semiconductor body (100) includes an injection efficiency control region (140) between a drift region (120) of a first conductivity type and a first electrode region (110) of a second, opposite conductivity type. The injection efficiency control region (140) includes a superjunction structure having a barrier region (142) of the first conductivity type and a compensation region (144) of a second conductivity type successively arranged along a lateral direction and directly adjacent one another. A net dopant concentration of the barrier region (142), averaged along a vertical extent of the barrier region (142), is at least three times greater than a net dopant concentration of the drift region (120), averaged along 20% of a vertical extension of the drift zone adjacent to the barrier region (142).
Description
HINTERGRUNDBACKGROUND
In Halbleitervorrichtungen, wie Halbleiterdioden, fluten bewegliche Ladungsträger die Halbleiterbereiche auf beiden Seiten eines vorwärts vorgespannten pn-Übergangs und können ein Ladungsträgerplasma bilden, das einen niedrigen Vorwärts- bzw. Durchlass- oder Einschaltwiderstand der Halbleitervorrichtung vorsieht, das aber in einer Rückwärtserholungsperiode entfernt werden muss, wenn sich der pn-Übergang von vorwärts vorgespannt nach rückwärts vorgespannt ändert. Der Rückwärtserholungsprozess trägt zu Schaltverlusten der Halbleitervorrichtung bei. Es ist wünschenswert, eine Halbleiterdiode vorzusehen, die einen optimierten Abgleich bzw. Ausgleich zwischen niedrigen Schaltverlusten, einer hohen Rückwärtsdurchbruchspannung und einer hohen Spitzenstromrobustheit hat. In semiconductor devices, such as semiconductor diodes, movable carriers flood the semiconductor regions on both sides of a forward biased pn junction and may form a charge carrier plasma that provides low forward or on resistance of the semiconductor device, but which must be removed in a reverse recovery period. when the pn junction changes from forward biased to reverse biased. The reverse recovery process contributes to switching losses of the semiconductor device. It is desirable to provide a semiconductor diode that has an optimized balance between low switching losses, high reverse breakdown voltage, and high peak current robustness.
ZUSAMMENFASSUNGSUMMARY
Es ist daher Aufgabe der vorliegenden Erfindung, eine Halbleiterdiode und ein Verfahren zum Herstellen einer Halbleiterdiode anzugeben, die jeweils den obigen Forderungen genügen. It is therefore an object of the present invention to provide a semiconductor diode and a method for producing a semiconductor diode, which respectively satisfy the above requirements.
Diese Aufgabe wird erfindungsgemäß durch eine Halbleiterdiode mit den Merkmalen des Patentanspruches 1 bzw. ein Verfahren mit den Merkmalen des Patentanspruches 17 gelöst. Vorteilhafte Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen. This object is achieved by a semiconductor diode having the features of
Gemäß einem Ausführungsbeispiel einer Halbleiterdiode umfasst diese einen Halbleiterkörper, der einen Injektionseffizienzsteuerbereich zwischen einem Driftbereich eines ersten Leitfähigkeitstyps und einem ersten Elektrodenbereich eines zweiten, entgegengesetzten Leitfähigkeitstyps hat. Der Injektionseffizienzsteuerbereich umfasst eine Superjunctionstruktur bzw. Superübergangsstruktur, die einen Barrierebereich des ersten Leitfähigkeitstyps und einen Kompensationsbereich eines zweiten Leitfähigkeitstyps hat, die nacheinander längs einer lateralen Richtung angeordnet sind und direkt aneinandergrenzen. Eine Nettodotierstoffkonzentration des Barrierebereiches, gemittelt längs einer vertikalen Ausdehnung des Barrierebereiches, ist wenigstens dreimal größer als eine Nettodotierstoffkonzentration des Driftbereiches, gemittelt längs 20% der vertikalen Ausdehnung der Driftzone angrenzend an den Barrierebereich. According to an embodiment of a semiconductor diode, the latter comprises a semiconductor body having an injection efficiency control region between a drift region of a first conductivity type and a first electrode region of a second, opposite conductivity type. The injection efficiency control region includes a superjunction structure having a barrier region of the first conductivity type and a compensation region of a second conductivity type sequentially arranged along a lateral direction and directly adjacent to each other. A net dopant concentration of the barrier region, averaged along a vertical extent of the barrier region, is at least three times greater than a net dopant concentration of the drift region, averaged along 20% of the vertical extent of the drift zone adjacent to the barrier region.
Gemäß einem Ausführungsbeispiel umfasst ein Verfahren zum Herstellen einer Halbleiterdiode in einem Halbleiterkörper, der einen Driftbereich eines ersten Leitfähigkeitstyps aufweist, ein Bilden eines ersten Elektrodenbereiches eines zweiten, entgegengesetzten Leitfähigkeitstyps in dem Halbleiterkörper an einer ersten Oberfläche des Halbleiterkörpers. Das Verfahren umfasst weiterhin ein Bilden einer Superjunctionstruktur bzw. Superübergangsstruktur zwischen dem Driftbereich und dem ersten Elektrodenbereich, wobei die Superjunctionstruktur einen Barrierebereich des ersten Leitfähigkeitstyps und einen Kompensationsbereich des zweiten Leitfähigkeitstyps aufweist, die nacheinander längs einer lateralen Richtung und direkt aneinander angrenzend angeordnet sind. Eine Nettodotierstoffkonzentration des Barrierebereiches, gemittelt längs einer vertikalen Ausdehnung des Barrierebereiches, ist wenigstens dreimal größer als eine Nettodotierstoffkonzentration des Driftbereiches, gemittelt längs 20% einer vertikalen Ausdehnung der Driftzone angrenzend an den Barrierebereich.According to an embodiment, a method of fabricating a semiconductor diode in a semiconductor body having a drift region of a first conductivity type comprises forming a first electrode region of a second, opposite conductivity type in the semiconductor body at a first surface of the semiconductor body. The method further comprises forming a superjunction structure between the drift region and the first electrode region, the superjunction structure having a barrier region of the first conductivity type and a compensation region of the second conductivity type successively arranged along a lateral direction and directly adjacent to each other. A net dopant concentration of the barrier region, averaged along a vertical extent of the barrier region, is at least three times greater than a net dopant concentration of the drift region, averaged along 20% of a vertical extension of the drift zone adjacent to the barrier region.
Der Fachmann wird zusätzliche Merkmale und Vorteile nach Lesen der folgenden Detailbeschreibung und Betrachten der begleitenden Zeichnungen erkennen.Those skilled in the art will recognize additional features and advantages after reading the following detailed description and considering the accompanying drawings.
KURZBESCHREIBUNG DER ZEICHNUNGENBRIEF DESCRIPTION OF THE DRAWINGS
Die beigefügten Zeichnungen sind beigeschlossen, um ein weiteres Verständnis der Erfindung zu liefern, und sie sind in die Offenbarung einbezogen und bilden einen Teil von dieser. Die Zeichnungen veranschaulichen die Ausführungsbeispiele der vorliegenden Erfindung und dienen zusammen mit der Beschreibung zum Erläutern von Prinzipien der Erfindung. Andere Ausführungsbeispiele der Erfindung und beabsichtigte Vorteile werden sofort gewürdigt, da sie unter Hinweis auf die folgende Detailbeschreibung besser verstanden werden.The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this disclosure. The drawings illustrate the embodiments of the present invention and, together with the description, serve to explain principles of the invention. Other embodiments of the invention and intended advantages will be readily appreciated as they become better understood by reference to the following detailed description.
DETAILBESCHREIBUNGLONG DESCRIPTION
In der folgenden Detailbeschreibung wird Bezug genommen auf die begleitenden Zeichnungen, die einen Teil der Offenbarung bilden und in denen für Veranschaulichungszwecke spezifische Ausführungsbeispiele gezeigt sind, in denen die Erfindung realisiert werden kann. Es ist zu verstehen, dass andere Ausführungsbeispiele verwendet und strukturelle oder logische Änderungen gemacht werden können, ohne von dem Bereich der vorliegenden Erfindung abzuweichen. Beispielsweise können Merkmale, die für ein Ausführungsbeispiel veranschaulicht oder beschrieben sind, bei oder im Zusammenhang mit anderen Ausführungsbeispielen verwendet werden, um zu noch einem weiteren Ausführungsbeispiel zu gelangen. Es ist zu verstehen, dass die vorliegenden Erfindung derartige Modifikationen und Veränderungen umfasst. Die Beispiele sind mittels einer spezifischen Sprache beschrieben, die nicht als den Bereich der beigefügten Patentansprüche begrenzend aufgefasst werden sollte. Die Zeichnungen sind nicht maßstabsgetreu und dienen lediglich für Veranschaulichungszwecke. Zur Klarheit sind die gleichen Elemente durch entsprechende Bezugszeichen in den verschiedenen Zeichnungen versehen, falls nicht etwas anderes festgestellt wird. In the following detailed description, reference is made to the accompanying drawings, which form a part of the disclosure, and in which, for purposes of illustration, specific embodiments are shown in which the invention may be practiced. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present invention. For example, features illustrated or described for one embodiment may be used in or in connection with other embodiments to yield yet a further embodiment. It is to be understood that the present invention includes such modifications and changes. The examples are described by means of a specific language, which should not be construed as limiting the scope of the appended claims. The drawings are not to scale and are for illustration purposes only. For clarity, the same elements are indicated by corresponding reference numerals in the various drawings unless otherwise stated.
Die Begriffe "haben", "enthalten", "umfassen", "aufweisen" und ähnliche Begriffe sind offene Begriffe, und diese Begriffe zeigen das Vorhandensein der festgestellten Strukturen, Elemente oder Merkmale an, schließen jedoch zusätzliche Elemente oder Merkmale nicht aus. Die unbestimmten Artikel und die bestimmten Artikel sollen sowohl den Plural als auch den Singular umfassen, falls sich aus dem Zusammenhang nicht klar etwas anderes ergibt.The terms "have," "include," "include," "have," and similar terms are open-ended terms, and these terms indicate the presence of the identified structures, elements, or features, but do not exclude additional elements or features. The indefinite articles and the definite articles shall include both the plural and the singular, unless the context clearly dictates otherwise.
Der Begriff "elektrisch verbunden" beschreibt eine permanente niederohmige Verbindung zwischen elektrisch verbundenen Elementen, beispielsweise einem direkten Kontakt zwischen den betreffenden Elementen oder eine niederohmige Verbindung über ein Metall und/oder einen hochdotierten Halbleiter. Der Begriff "elektrisch gekoppelt" umfasst, dass ein oder mehrere dazwischenliegende Elemente, die für eine Signalübertragung geeignet sind, zwischen den elektrisch gekoppelten Elementen vorhanden sein können, beispielsweise Elemente, die steuerbar sind, um zeitweise eine niederohmige Verbindung in einem ersten Zustand und eine hochohmige elektrische Entkopplung in einem zweiten Zustand vorzusehen. The term "electrically connected" describes a permanent low-resistance connection between electrically connected elements, for example a direct contact between the relevant elements or a low-resistance connection via a metal and / or a heavily doped semiconductor. The term "electrically coupled" includes that one or more intermediate elements suitable for signal transmission may be present between the electrically coupled elements, for example, elements that are controllable to temporarily provide a low resistance connection in a first state and a high impedance provide electrical decoupling in a second state.
Die Figuren veranschaulichen relative Dotierungskonzentratio nen durch Angabe von "–" oder "+" nächst zu dem Dotierungstyp "n" oder "p". Beispielsweise bedeutet "n–" eine Dotierungskonzentration, die niedriger ist als die Dotierungskonzentration eines "n"-Dotierungsbereiches, während ein "n+"-Dotierungsbereich eine größere Dotierungskonzentration hat als ein "n"-Dotierungsbereich. Dotierungsbereiche der gleichen relativen Dotierungskonzentration haben nicht notwendigerweise die gleiche absolute Dotierungskonzentration. Beispielsweise können zwei verschiedene "n"-Dotierungsbereiche die gleichen oder verschiedene absolute Dotierungskonzentrationen haben. The figures illustrate relative doping concentrations by indicating "-" or "+" next to the doping type "n" or "p". For example, "n - " means a doping concentration lower than the doping concentration of an "n" -doping region, while an "n + " -doping region has a larger doping concentration than an "n" -doping region. Doping regions of the same relative doping concentration do not necessarily have the same absolute doping concentration. For example, two different "n" doping regions may have the same or different absolute doping concentrations.
Der Halbleiterkörper
In einer Ebene senkrecht zu der Querschnittsebene kann der Halbleiterkörper
Der Halbleiterkörper
Für die veranschaulichten Ausführungsbeispiele ist der erste Leitfähigkeitstyp der n-Typ, und der zweite Leitfähigkeitstyp ist der p-Typ. Somit kann der erste Elektrodenbereich
Eine Nettodotierstoffkonzentration, d.h., ein Absolutwert der Differenz zwischen einer n-Typ-Dotierstoffkonzentration und einer p-Typ-Dotierstoffkonzentration in dem Driftbereich
Eine erste Lastelektrode
Eine zweite Lastelektrode
Jede der ersten und zweiten Lastelektroden
Ein Injektionseffizienzsteuerbereich
Der sandwichartig zwischen dem ersten Elektrodenbereich
Eine gesamte Dotierstoffmenge (effektive Elektrodendosis) in dem ersten Elektrodenbereich
Wenn der pn-Übergang zwischen dem ersten Elektrodenbereich
Gegenwärtige Methoden zum Reduzieren der Anodeneffizienz in dem Injektionsbereich zielen auf ein Reduzieren der effektiven Anodendosis in dem ersten Elektrodenbereich
Gemäß einem Ausführungsbeispiel enthält der Barrierebereich
Der Kompensationsbereich
Der Kompensationsbereich
Wie in
Wie in
Wie in
Die Barrierebereiche
Wie in
In den
Wie in
Wie in
Die Überkompensation an Akzeptoren in den Kompensationsbereichen
Eine Überkompensation von Akzeptoren durch Donatoren kann auch erzielt werden, indem die Barrierebereiche
Wie in
In
Wie in
Eine Simulation einer Struktur, die einen Kompensationsbereich
Wie in
Durch Vorsehen der Struktur, wie diese in
Die
Die
Die
Eine Abhängigkeit der Kennlinien bzw. Eigenschaften der Halbleiterdiode
Durch Vorsehen einer Veränderung bzw. Variation einer Nettodotierstoffkonzentration längs einer vertikalen Richtung innerhalb des Kompensationsbereiches
Anhand der
Wie aus den
Wie in den
Anhand der
Wie in
Wie in
Wie in
In einem anderen Ausführungsbeispiel, das in
Wenn ein Dotieren mit PLAD vorgenommen wird, wird der die Trenches
Eine Eindringtiefe der Dotierstoffe in die Barriereschicht
Gemäß einem Ausführungsbeispiel umfasst ein Dotieren des Halbleiterkörpers
Nach einem Diffusionsschritt in
Anhand der
Wie in den
Anhand der
Wie in den
Wie in
Die Halbleiterdiode gemäß einem Ausführungsbeispiel ermöglicht eine Anreicherung der Dotierstoffkonzentration und/oder eine Injektionstiefe des Emitterbereiches, ohne eine exzessive Zunahme eines Abschaltenergieverlustes, da die Barrierebereiche
Obwohl spezifische Ausführungsbeispiele hier veranschaulicht und beschrieben sind, ist es für den Fachmann selbstverständlich, dass eine Vielzahl von alternativen und/oder äquivalenten Gestaltungen für die spezifischen gezeigten und beschriebenen Ausführungsbeispiele herangezogen werden kann, ohne von dem Bereich der vorliegenden Erfindung abzuweichen. Diese Anmeldung soll jegliche Anpassungen oder Veränderungen der hier diskutierten spezifischen Ausführungsbeispiele abdecken. Daher ist beabsichtigt, dass diese Erfindung lediglich durch die Patentansprüche und deren Äquivalente begrenzt ist.Although specific embodiments are illustrated and described herein, it will be understood by those skilled in the art that a variety of alternative and / or equivalent configurations may be utilized for the specific embodiments shown and described without departing from the scope of the present invention. This application is intended to cover any adaptations or variations of the specific embodiments discussed herein. Therefore, it is intended that this invention be limited only by the claims and their equivalents.
Claims (22)
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US14/253,920 | 2014-04-16 | ||
US14/253,920 US9093568B1 (en) | 2014-04-16 | 2014-04-16 | Semiconductor diode |
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JP6217700B2 (en) * | 2015-07-21 | 2017-10-25 | トヨタ自動車株式会社 | diode |
DE102016117723A1 (en) * | 2016-09-20 | 2018-03-22 | Infineon Technologies Ag | Diode structure of a power semiconductor device |
CN109638083B (en) * | 2018-12-29 | 2024-04-05 | 捷捷半导体有限公司 | Fast recovery diode and preparation method thereof |
EP3748689A1 (en) * | 2019-06-06 | 2020-12-09 | Infineon Technologies Dresden GmbH & Co . KG | Semiconductor device and method of producing the same |
CN112820644B (en) * | 2020-12-31 | 2023-08-15 | 扬州扬杰电子科技股份有限公司 | Gallium nitride PN diode with high blocking voltage and preparation method thereof |
EP4095888A1 (en) * | 2021-05-28 | 2022-11-30 | Hitachi Energy Switzerland AG | Semiconductor device having a reduced concentration of carbon vacancies and method for manufacturing a semiconductor device |
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DE4310444C2 (en) | 1993-03-31 | 1995-05-11 | Semikron Elektronik Gmbh | Fast power diode |
EP0657933B1 (en) * | 1993-12-13 | 2000-06-28 | Consorzio per la Ricerca sulla Microelettronica nel Mezzogiorno | Integrated structure active clamp for the protection of power semiconductor devices against overvoltages |
DE4410444C2 (en) | 1994-03-25 | 1998-02-26 | Framatome Connectors Int | FO connector |
US5925910A (en) * | 1997-03-28 | 1999-07-20 | Stmicroelectronics, Inc. | DMOS transistors with schottky diode body structure |
DE19740195C2 (en) | 1997-09-12 | 1999-12-02 | Siemens Ag | Semiconductor device with metal-semiconductor junction with low reverse current |
JP4447065B2 (en) * | 1999-01-11 | 2010-04-07 | 富士電機システムズ株式会社 | Superjunction semiconductor device manufacturing method |
GB0107408D0 (en) * | 2001-03-23 | 2001-05-16 | Koninkl Philips Electronics Nv | Field effect transistor structure and method of manufacture |
JP4119148B2 (en) * | 2002-04-02 | 2008-07-16 | 株式会社東芝 | diode |
US20050275065A1 (en) * | 2004-06-14 | 2005-12-15 | Tyco Electronics Corporation | Diode with improved energy impulse rating |
US7045830B1 (en) * | 2004-12-07 | 2006-05-16 | Fairchild Semiconductor Corporation | High-voltage diodes formed in advanced power integrated circuit devices |
US8110869B2 (en) * | 2005-02-11 | 2012-02-07 | Alpha & Omega Semiconductor, Ltd | Planar SRFET using no additional masks and layout method |
JP2010199480A (en) | 2009-02-27 | 2010-09-09 | Fuji Electric Systems Co Ltd | Superjunction schottky diode |
US8933506B2 (en) | 2011-01-31 | 2015-01-13 | Alpha And Omega Semiconductor Incorporated | Diode structures with controlled injection efficiency for fast switching |
DE102011080258A1 (en) | 2011-08-02 | 2013-02-07 | Robert Bosch Gmbh | Super junction Schottky oxide PiN diode |
US9324625B2 (en) * | 2012-05-31 | 2016-04-26 | Infineon Technologies Ag | Gated diode, battery charging assembly and generator assembly |
CN103594523A (en) * | 2013-11-07 | 2014-02-19 | 哈尔滨工程大学 | Double-layer super-junction Schottky diode |
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